Preparation of Microporous Thermoplastic Polyurethane by Supercritical Carbon Dioxide Foaming Technique

• Main Authors: Sheng-Ping Peng, 彭昇平
• Other Authors: Shu-Kai Yeh
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/64w422

碩士 === 國立臺北科技大學 === 化學工程研究所 === 102 === Thermoplastic polyurethane (TPU) possesses many special characteristics. The flexibility, rigidity, and elasticity can be adjusted by controlling the ratio of soft segments and hard segments. Due to its versatile physical properties, TPU is commonly used in transportation, construction, and biomaterials. However, the technique of producing TPU foam by CO2 is still under investigation. Our laboratory previously prepared nanoporous TPU foam using commercially available TPU. In this study, TPU was synthesized using 4, 4’-methylene bis-(phenyl isocyanate) (MDI), poly(propylene glycol) (PPG) and 1,4-butanediol(BD) without solvent using a pre-polymer method. The remaining NCO groups in the TPU were determined by titration of pre-polymer, Fourier transform infrared spectroscopy (FTIR), thermal analysis (Differential scanning calorimetry, (DSC) and Thermogravimetric Analyzer, (TGA) and mechanical properties). The synthesized TPU was foamed by batch foaming using scCO2 as the blowing agent, and the effect of saturation temperature, saturation pressure and saturation time to the cell morphology TPU foam was examined.